The latest release of VirusScan, Version 4.x, diverges radically from previous releases -- not so much externally as internally. The biggest change is in the virus scanning engine itself. The Dr. Solomon's virus scanning engine is at the heart of VirusScan 4.x, replacing the various engines used in earlier releases of VirusScan. Because the previous scanning engines and the new Dr. Solomon's scanning engine identify and classify viruses in different ways, the virus definition updates (DAT files) for earlier releases of VirusScan will not work on the 4.x releases; conversely, the DAT files for v4.x and above will not work on earlier releases of VirusScan.
The 4.x series of VirusScan also supports virus detection and removal of polymorphic and macro viruses (including Office97 viruses) using enhanced heuristic scanning technology. Additional features in the latest releases include ZIP file scanning, an Emergency Disk creation utility, activity log reports, compressed file scanning support (ZIPs, CABs, etc.), and ScanPM (a command-line scanner that operates in protected mode environments like DOS).
